Focus servo device
专利汇可以提供Focus servo device专利检索，专利查询，专利分析的服务。并且PURPOSE: To migrate control from initial pull-in control to focus servo control at the most desirable state by performing an initial pull-in operation by a coarse moving actuator when a device is started up, and keeping a fine moving actuator at an intermediate position in that period.
CONSTITUTION: Double actuator structure of the fine moving actuator 4a which displaces the objective lens 22 of an optical head in a direction of optical axis and the coarse moving actuator 4b which displaces the optical head in the direction of optical axis with the fine moving actuator 4a is employed. And the initial pull-in control is performed by the coarse moving actuator 4b at a state keeping the fine moving actuator 4a at the intermediate position, and the coarse moving actuator 4b is stopped at a time when a just focus state is detected by initial pull-in, and the fine moving actuator 4a is operated, then, the focus servo control is performed. In such a way, the fine moving actuator 4a is always positioned at an intermediate point, and focus servo is performed centering the point, therefore, the traceability of the objective lens 22 for the plane of an optical disk 21 can be kept at the most satisfactory state.
COPYRIGHT: (C)1990,JPO&Japio，下面是Focus servo device专利的具体信息内容。
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